I haven't worked preload in several years. As mentioned above, most of the time your floor stops are businesses. However, you can have a bulkstop that is numbered. It is ok to put it on the floor that is near that section of the shelf. Just do the job as you were trained to do it. Use the methods and work safe. If the driver wants it done a way different than the way you were taught then he can rearrange it. I didn't mind do things a certain way if a driver wanted it done, but no way am I going to rearrange the entire way I load the truck.